The Record Plant had several studios. One in Los Angeles and another in Sausalito. The Sausalito location (where large parts of Rumours was recorded) was sold and is still an active studio today, I follow it on instagram. It appears that the Los Angeles location was sold and closed.
Tusk was recorded at The Village Recorder Studios and is also still active. BuckVie was also recorded here. The large hall there was also used for the 2013 Fleetwood Mac press interviews, it was a Masonic Hall in the 1920s:
https://www.youtube.com/watch?v=QSDsV05Nj-k
The Sausalito location is now 2200 Studios:
https://2200studios.com/